Exercise bicycle



1.1 is a front perspective view of an exercise bicycle showing our new design;

1.2 is a left side view thereof;

1.3 is top view thereof;

1.4 is a right side view thereof;

1.5 is a back view thereof;

1.6 is a front view thereof; and

1.7 is a back perspective view thereof.

The broken lines in the drawing illustrate matter that forms no part of the claim. 

CLAIM The ornamental design for an exercise bicycle, as shown and described. 